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AKjDPG: Arbeitskreis junge DPG

AKjDPG 7: PhD Focus Session: In-situ probes toward better understanding of hybrid halide perovskites II (joint session CPP/AKjDPG)

AKjDPG 7.5: Hauptvortrag

Freitag, 20. März 2020, 10:45–11:15, ZEU 222

Structural dynamics of halide perovskites via in-situ electron microscopy — •Chen Li — Electron microscopy for Materials research (EMAT), University of Antwerp, Antwerp, Belgium

In-situ microscopy is a powerful tool to investigate dynamic transformations in materials. To observe such transformations the focused electron probe in scanning transmission electron microscope (STEM) can be used to both stimulate and image the movement of atoms [1]. Here we apply such dynamic STEM to directly observe ion migration in hybrid and inorganic halide perovskites.

Direct in-situ heating of samples can also be used inside electron microscopes to provoke phase changes with special heating holders [2]. We use in-situ heating in STEM to track the phase transitions in inorganic CsPbI3 perovskites from an orthorhombic δ- phase to a cubic α-phase. An intermediate phase with layered configuration was observed during the transition.

[1] C. Li, Y. Y. Zhang, T. J. Pennycook, Y. L. Wu, A. R. Lupini, N. R. Paudel, S. T. Pantelides, Y. Yan and S. J. Pennycook, Column-by-column observation of dislocation motion in CdTe: dynamic scanning transmission electron microscopy, Appl. Phys. Lett. 2016, 109, 143107

[2] C. Li, E. S. Sanli, H. Strange, M. D. Heinemann, D. Greiner, R. Mainz, W. Sigle, D. Abou-Ras and P. A. v. Aken, Diffusion-assisted grain boundary migration in CuInSe2. under review